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Fan power is measured by CFM, or cubic feet per minute. For every 1,000 feet of square footage in your attic, you need a minimum of 700 CFM. Steeper roofs may need larger fans or about 840 CFM.  You can figure the size of attic fan you need by multiplying the square footage of your attic floor by 0.7. (multiply by 1.2 for a steep roof and 1.15 for a dark roof). That number is the CFM required for your fan to run efficiently.

Most duct booster fans are not designed to run continuously, though some models can be programmed for constant operation. Typically, they are controlled by the user via a switch, controls on the unit itself, or by being wired to the HVAC system's thermostat. Wiring the fan to a thermostat allows it to run automatically only when heating or cooling is active, which saves energy and is an effective way to activate the fan only when needed to address issues like uneven room temperatures.

There are many types of ceiling fans, each with specific features and advantages. Standard ceiling fans are a traditional choice suitable for most spaces and can be made from materials like plastic, wood, metal, or fiberboard. For rooms with low ceilings, low-profile fans are a better fit. Other specialized types include smart fans, which you can control with a smartphone or voice commands, and dual-motor fans that provide increased airflow in multiple directions. For energy savings, Energy-Star certified fans can be up to 60% more efficient than standard models, helping to lower your utility bill. You can also find fans with built-in lights, fans with retractable blades, and large ceiling fans designed for spacious rooms with ceilings between 10 and 25 feet high.

The lifespan of an attic fan depends on the type. Passive fans can last 40 to 50 years, while electric and solar models typically last 10 to 15 years. You can extend the life of your fan with regular maintenance, such as cleaning the fan blades and shutters and checking for moisture. For professional service, you can consult a local attic fan installer or have an HVAC technician clean, oil, and inspect the unit for potential issues.